Gyronycha Casey, 1894

Klimaszewski, Jan, Webster, Reginald P., Zanetti, Adriano & Bourdon, Caroline, 2017, First Canadian records of genera Apimela Mulsant & Rey and Gyronycha Casey from New Brunswick: description of two new species and new provincial distribution records (Coleoptera, Staphylinidae, Aleocharinae), ZooKeys 672, pp. 35-48 : 38-39

Gyronycha Casey, 1894 Figs 16-22, 23-26

Type species.

Gyronycha valens Casey, 1894.

Diagnosis.

Body yellowish brown, narrow and linear, length 2.5-4.2 mm; forebody densely and finely pubescent; head round, as large as pronotum, eyes large, about as long as postocular area of head visible from above, posterior angles of head rounded, basal carina vestigial and visible only basally; antennomeres V-X slightly to strongly elongate; last palpomere needle-shaped; pronotum slightly transverse, widest in apical third, as long as head, densely pubescent, pubescence on midline of disc directed anteriad except posteriad basally, on sides anteriad and laterad, forming arcuate lines; elytra strongly elongate, one fifth broader than pronotum, at suture longer than pronotum, pubescence directed obliquely postriad; mesoventrite long, mesocoxae close; abdomen parallelsided, first four visible tergites with deep arcuate impressions, males with tubercles on first and fifth visible tergites; basal metatarsus as long as the following two combined, tarsi large; median lobe of aedeagus with strongly sinuate venter of tubus in lateral view, crista apicalis of bulbus moderately large, internal sac with complex sclerites; spermatheca with broadly and irregularly coiled stem, coils overlapping. New Brunswick specimens of this genus were found in gravel in a riparian habitat.